Premier Duo Gymnastics Mat 2' Panel 5X10'X2 3/8" with Hook/Loop V-4 Blue One side 1 3/8" cross-linked polyethylene; The other side with softer 1" polyfoam Can be switched over for different applications Light weight 18 oz. Knife-coated Vinyl Cover. THIS MAT HAS VELCRO ON ALL 4 SIDES FOR THE ABILITY TO ATTACH MULTIPLE MATS TOGETHER. Double-reinforced nylon stitching with inverted seams